Thanks. Judging from the log and from some recent discussions on the openal mailing list, this might actually be an OpenAL Soft issue that was fixed in the 1.10.662 release. It would really help if you could confirm whether the error shows up in this version.

(Compiling openal-soft is relatively easy: you need cmake and the pulseaudio dev packages. Do not install the generated .so, but rather copy it to your application directory and modify OpenTK.dll.config to map "openal32.dll" to "./libopenal.so.1" (note the "./")).

I am installing a new openSUSE 11.2 virtual machine for testing but this is going to take some time.

This is a known bug in the pulseaudio backend of OpenAL Soft 1.9. Sadly, there is nothing OpenTK can do about this.

The solution is to have openSUSE upgrade to OpenAL Soft 1.10. Till then, you can work around the issue by disabling the pulseaudio driver: create a file named ~/.alsoftrc in your home directory and add the following lines: